BioMedical Admissions Test (BMAT) Practice Test 2026 - Free BMAT Practice Questions and Study Guide

Power is defined as the rate of transfer of energy. This means that power quantifies how quickly energy is being transferred from one system to another or converted from one form to another, such as in mechanical systems, electrical circuits, or thermal processes. It is measured in watts (W), where one watt equals one joule of energy transferred per second.

In contrast, the other terms do not adequately define this concept. Energy transfer rate, while a descriptive phrase, is not the accepted term in physics and does not carry the same formal definition as power. Work done refers to the energy transferred by a force moving an object over a distance, but it does not inherently convey the rate at which energy is transferred. Velocity of energy is not a recognized concept in physics, as velocity typically pertains to speed and direction of an object, not energy transfer. Therefore, power is the correct term to describe the rate of energy transfer.